jQuery Grid Plugin - jqGrid

Hi there, im still a newbie using jqgrid, been working with it for about two months now, and i really don't understand how to create a custom form and use the gridtoform inside the custom button i created, i've searched the forum for tips or examples but no luck, could someone give some guidelines so i can have a better understanding, basically im lost on where do i create the custom form, and how do i use the gridtoform inside the function() of my new button on the navgrid

Regards!

Erick